Which of these statements about airplane and rocket flight is true?A.Only one requires air molecules to generate lift.B.Only one requires both fuel and an oxidizer for the combustion reaction.C.Only one must overcome the force of gravity.D.Only one requires combustion reactions to generate thrust.

Mr. Walters is launching a toy rocket.The rocket experiences a force that pushes it up into the air. Which of the following statements is true? A. The exhaust gases of the rocket are shot downward with an equal force. B. The rocket has no mass, so it does not accelerate. C. The rocket exerts an upward force on its fuel. D. The air does not experience any force as the rocket passes through it.

Assertion (A): In case of burning, air and moisture are necessary.Reason(R): Oxygen is a supporter of combustion.(a) Both A and R are true and R is the correct explanation of A(b) Both A and R are true but R is not the correct explanation of A(c) A is true but R is false(d) A is false but R is true

Which of the following statements is / are FALSE? (select all appropriate)Question 45Answera.During inhalation, air enters the lungs by moving down its pressure gradient, from an area of higher pressure outside the body to an area of lower pressure within the lungs.b.During forced breathing, both inhalation and exhalation are active processes that make use of muscle contractions.c.Pressure and volume are inversely related (Boyle's law)d.During exhalation, air exits the lungs by moving against its pressure gradient, from an area of lower pressure within the lungs to an area of higher pressure outside the bodye.The contraction of the diaphragm and external intercostal muscles is the first step of

Which among the following statements is not true?

Read the given statements and select the correct option.Statement 1: Phosphorus burns in air at room temperature.Statement 2: It is an example of spontaneous combustion.A) Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.B) Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.C) Statement 1 is true and statement 2 is false.D) Both statements 1 and 2 are false